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Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
IFRS Statement [Line Items]        
Financial assets measured at fair value through profit or loss $ 13,500 $ 9,768    
Financial assets measured at fair value through other comprehensive income 709 791    
Measured at amortized cost:        
Cash and cash equivalents 101,055 106,437 $ 138,023 $ 184,452
Financial asset at amortized cost 11,049 11,229    
Accounts receivable and other receivables (including related parties) 164,943 189,279 $ 188,774  
Restricted deposit (including current and noncurrent) 164,000 164,326    
Total 463,195 488,013    
Financial assets at amortised cost, category [member]        
Measured at amortized cost:        
Cash and cash equivalents 101,055 106,437    
Financial asset at amortized cost 11,049 11,229    
Accounts receivable and other receivables (including related parties) 168,377 194,021    
Restricted deposit (including current and noncurrent) 164,133 164,456    
Refundable deposits 4,372 1,311    
Subtotal $ 448,986 $ 477,454